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吕志杰,邓莉莉,田清波,程凯强,赵晓丽.仿生结构复合陶瓷刀具材料力学性能及显微结构[J].稀有金属材料与工程(英文),2018,47(12):3848~3852.[LV Zhijie,DENG Lili,TIAN Qingbo,CHENG Kaiqiang and ZHAO Xiaoli.Microstructure and Mechanical Properties of Biomimetic Composite Ceramic Tool Materials[J].Rare Metal Materials and Engineering,2018,47(12):3848~3852.]
Microstructure and Mechanical Properties of Biomimetic Composite Ceramic Tool Materials
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Received:March 30, 2017  Revised:April 09, 2017
DOI:
Key words: biomimetic structure  composite ceramic cutting tool material  microstructure  mechanical properties
Foundation item:国家自然科学基金资助(项目号51375281)
Author NameAffiliation
LV Zhijie,DENG Lili,TIAN Qingbo,CHENG Kaiqiang and ZHAO Xiaoli  
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Abstract:
      :According to different sintering conditions and TiC/WC composition ratio, three-layer biomimetic composite ceramic tool materials were prepared by hot pressing sintering process. The mechanical properties of the biomi-metic composite ceramic materials were tested, and the fracture surface morphology and crack propagation were analyzed. The flexural strength, Vickers hardness and fracture toughness are 870 MPa, 21.83 GPa, and 7.56 MPa?m1/2, which is higher than that of SG4 homogeneous ceramic cutting tool material. Section morpholo-gies show that the bioimimetic composite ceramic material has finer microstructure than that of SG4 ceramic cuttin tool material, and the grain size shows multi-scale characteristic. Fracture surfaces demonstrate a trans-granular/intergranular mode. The crack propagation path of the surface layer shows crack deflection and bifur-cation of the crack tip.The crack is also deflected as crack passing through the bi-material interface.